2002 Mercedes-benz M Class Owners Manual

position “P”. With a malfunction in the vehicle’s electrical system the selector lever could remain locked in position “P”. To unlock the selector lever manually, see page 281. Reverse gear Shift to reverse gear only with the vehicle stopped.

Neutral No power is transmitted from the engine to the drive axle. When the brakes are released, the vehicle can be moved freely (pushed or towed). Do not engage “N” while driving except to coast when the vehicle is in danger of skidding (e.g. on icy roads, see winter driving instructions on page 199). Important! Coasting the vehicle, or driving for any other reason with selector lever in “N” can result in transmission damage that is not covered by the Mercedes-Benz Limited Warranty. The transmission automatically upshifts through 5th gear. Position “D” provides optimum driving characteristics under all normal operating conditions.

Gear selection for special circumstances The transmission gear ranges for special circumstances can be selected by pressing the selector lever to the right or the left with the selector lever in position “D”. The gear range currently selected is indicated in the instrument cluster display. Briefly press selector lever in the “D –” direction: The transmission will shift from the current gear range to the next lower gear range. Press and hold selector lever in the “D –” direction: The selector lever position display will switch to the gear range currently selected by the automatic transmission. Shifting into another gear range that allows for quicker acceleration or to slow the vehicle down is possible. Downshifts can also be performed.

Note: To avoid overrevving the engine when the selector lever is moved in “D –” direction, the transmission will not shift to a lower gear range if the engine’s revolutions per minute limit would be exceeded.

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Briefly press selector lever in the “D +” direction: The transmission will shift from the current gear range to the next higher gear range. Press and hold selector lever in the “D +” direction: The transmission will shift from the current gear range directly to gear range “D”.

Warning! On slippery road surfaces, never downshift in order to obtain braking action. This could result in drive wheel slip and reduced vehicle control. Your vehicle’s ABS will not prevent this type of loss of control.

During the brief warm-up period this delayed upshift and increased engine noise might be perceived as a malfunction. However, neither the engine nor transmission are negatively affected by this mode of operation. The delayed upshift is effective with vehicle speeds below 31 mph (50 km/h) at partial throttle and engine temperatures below 95°F (35°C). To prevent the engine from laboring at low RPM when driving uphill gradients or with your vehicle heavily loaded, the automatic transmission will downshift when necessary to maintain engine RPM within the best torque range.

Important! With transmission in gear range “D”, “4” or “3”, upshifting from 1st to 2nd to 3rd gear is delayed depending on vehicle speed and engine temperature. This allows the catalytic converter to heat up more quickly to operating temperatures.

Note: To avoid overrevving the engine on the rpm limit, the transmission will upshift automatically to the next higher gear range as long as the vehicle is accelerating.

Gear ranges:

Upshift through 4th gear only. Suitable for performance driving. Upshift through 3rd gear only. Suitable for moderately steep hills. Since the transmission does not shift higher than 3rd gear, this gear selection will allow use of the engine’s braking power downhill. Upshift through 2nd gear only. For driving in mountainous regions or under extreme operating conditions. This gear selection will allow use of the engine’s braking power when descending steep grades. Use this position, which makes maximum use of the engine’s braking effect, while descending very steep or lengthy downgrades and only at speeds below 40 mph (60 km/h).

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Emergency operation (Limp home mode) If vehicle acceleration worsens or the transmission no longer shifts, the transmission is most likely operating in Limp home mode which engages when there is a malfunction of the transmission. This condition may be accompanied by the “CHECK ENGINE” malfunction indicator lamp in the instrument cluster coming on. In this mode only the 2nd gear or reverse gear can be activated.

To engage 2nd gear or reverse:

1. Stop the vehicle. 2. Move selector lever to position “P”. 3. Turn key in steering lock to position 0. 4. Wait at least 10 seconds. 5. Restart the engine. 6. Move selector lever to position “D” (for 2nd gear), or move selector lever to position “R” (for reverse gear).

Have the transmission checked at your authorized Mercedes-Benz Light Truck Center as soon as possible.

Parking brake

To engage, firmly depress parking brake pedal (1). When the key is in steering lock position 2, the brake warning lamp É in the instrument cluster should come on brightly.

To release the parking brake, pull handle (2) on instrument panel. The brake warning lamp É in the instrument cluster should go out. A warning sounds, if you start to drive without having released the parking brake. Also see brake warning lamp on page 241.

Warning! When leaving the vehicle always remove the key from the steering lock, and lock the vehicle. Do not leave children unattended in the vehicle, or with access to an unlocked vehicle. Children could release the parking brake, which could result in an accident or serious injury.

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Driving instructions

Drinking and driving

Drive sensibly – save fuel Fuel consumption, to a great extent, depends on driving habits and operating conditions. To save fuel you should: • keep tires at the recommended inflation pressures, • remove unnecessary loads, • remove roof rack when not in use, • allow engine to warm up under low load use, • avoid frequent acceleration and deceleration, • have all maintenance work performed at regular intervals by an authorized Mercedes-Benz Light Truck Center.

Fuel consumption is also increased by driving in cold weather, in stop-and-go traffic, on short trips and in hilly country.

Warning! Drinking or taking drugs and driving can be a very dangerous combination. Even a small amount of alcohol or drugs can affect your reflexes, perceptions and judgement. The possibility of a serious or even fatal accident is sharply increased when you drink or take drugs and drive. Please don’t drink or take drugs and drive or allow anyone to drive after drinking or taking drugs.

Pedals

Warning! Keep driver’s foot area clear at all times. Objects stored in this area may impair pedal movement.

Power assistance

Warning! When the engine is not running, the brake and steering systems are without power assistance. Under these circumstances, a much greater effort is necessary to stop or steer the vehicle.

Brakes

Warning! After driving in heavy rain for some time without applying the brakes or through water deep enough to wet brake components or salty road conditions, the first braking action may be somewhat reduced and increased pedal pressure may be necessary to obtain expected braking effect. Be sure to maintain a safe distance from vehicles in front. Resting your foot on the brake pedal will cause excessive and premature wear of the brake pads. It can also result in the brakes overheating thereby significantly reducing their effectiveness. It may not be possible to stop the vehicle in sufficient time to avoid an accident.

Excessive use of road salt and other snow melting chemicals spread on roads during the winter months may cause a build up of moisture or residue to form on the braking components. This build up or residue could cause light corrosion of the braking components if the vehicle is parked with the brakes cold. Apply steady and even braking pressure when stopping the vehicle to warm up and dry the brake components.

Important! Please pay attention to the function of the brake assist system (BAS), see page 217.

The condition of the parking brake system is checked each time the vehicle is in the shop for the required maintenance service. If the parking brake is released and the brake warning lamp in the instrument cluster stays on and there is no audible warning (EBP), the brake fluid level in the reservoir is too low. Brake pad wear or a leak in the system may be the reason for low brake fluid in the reservoir. Have the brake system inspected at an authorized Mercedes-Benz Light Truck Center immediately.

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All checks and service work on the brake system should be carried out by an authorized Mercedes-Benz Light Truck Center. Install only brake pads and brake fluid recommended by Mercedes-Benz.

Warning! If other than recommended brake pads are installed, or other than recommended brake fluid is used, the braking properties of the vehicle can be degraded to an extent that safe braking is substantially impaired. This could result in an accident.

Caution! When driving down long and steep grades, relieve the load on the brakes by shifting into a lower gear to use the engine’s braking power. This helps prevent overheating of the brakes and reduces brake pad wear. After hard braking, it is advisable to drive on for some time, rather than immediately parking, so the air stream will cool down the brakes faster.

Driving off Apply the service brakes to test them briefly after driving off. Perform this procedure only when the road is clear of other traffic. Warm up the engine smoothly. Do not place full load on the engine until the operating temperature has been reached. When starting off on a slippery surface, do not allow one drive wheel to spin for an extended period with the ESP switched off. Doing so may cause serious damage to the drive train which is not covered by the Mercedes-Benz Limited Warranty.

Parking

Tires

Warning! To reduce the risk of personal injury as a result of vehicle movement, before turning off the engine and leaving the vehicle, always: 1. Keep right foot on the service brake pedal. 2. Firmly depress parking brake pedal. 3. Move the selector lever to position “P”. 4. Slowly release the service brake pedal. 5. Turn front wheels towards the road curb. 6. Turn the key to steering lock position 0 and

remove.

7. Take the key and lock vehicle when leaving.

Important! It is advisable to set the parking brake whenever parking or leaving the vehicle. In addition, move selector lever to position “P”. When parking on hills, always set the parking brake.

Warning! If you feel a sudden significant vibration or ride disturbance, or you suspect that possible damage to your vehicle has occurred, you should turn on the hazard warning flashers, carefully slow down, and drive with caution to an area which is a safe distance from the roadway. Inspect the tires and under the vehicle for possible damage. If the vehicle or tires appear unsafe, have it towed to the nearest Mercedes-Benz Light Truck Center or tire dealer for repairs.

Tread wear indicators (TWI) are required by law. These indicators are located in six places on the tread circumference and become visible at a tread depth of approximately 1/16 in (1.5 mm), at which point the tire is considered worn and should be replaced. The tread wear indicator appears as a solid band across the tread.

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Specified tire pressures must be maintained. This applies particularly if the tires are subjected to high loads (e.g. high speeds, heavy loads, high ambient temperatures).

Warning! Do not drive with a flat tire. A flat tire affects the ability to steer or brake the vehicle. You may lose control of the vehicle. Continued driving with a flat tire or driving at high speed with a flat tire will cause excessive heat build-up and possibly a fire.

Aquaplaning Depending on the depth of the water layer on the road, aquaplaning may occur, even at low speeds and with new tires. Reduce vehicle speed, avoid track grooves in the road and apply brakes cautiously in the rain.

Warning! Do not allow your tires to wear down too far. As tread depth approaches 1/16 in (1.5 mm), the adhesion properties on a wet road are sharply reduced. Depending upon the weather and/or road surface (conditions), the tire traction varies widely.

Tire traction The safe speed on a wet, snow covered or icy road is always lower than on a dry road. You should pay particular attention to the condition of the road whenever the outside temperatures are close to the freezing point.

Warning! If ice has formed on the road, tire traction will be substantially reduced. Under such weather conditions, drive, steer and brake with extreme caution.

We recommend M+S rated radial-ply tires with a minimum tread depth of approximately 1/8 in (4 mm) for the winter season for all four wheels to insure normal balanced handling characteristics. On packed snow, they can reduce your stopping distance as compared with summer tires. Stopping distance, however, is still considerably greater than when the road is not snow or ice covered.

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Tire speed rating ML 320: Your vehicle is factory equipped with “H”-rated tires, which have a maximum speed rating of 130 mph (210 km/h). ML 500: Your vehicle is factory equipped with “V”-rated tires, which have a maximum speed rating of 150 mph (240 km/h). An electronic speed limiter prevents your vehicle from exceeding a speed of 130 mph (210 km/h). ML 55 AMG: Your vehicle is factory equipped with “W”-rated tires, which have a maximum speed rating of 168 mph (270 km/h).

Despite the tire rating, local speed limits should be obeyed. Use prudent driving speeds appropriate to prevailing conditions.

Warning! Even when permitted by law, never operate a vehicle at speeds greater than the maximum speed rating of the tires. Exceeding the maximum speed for which tires are rated can lead to sudden tire failure causing loss of vehicle control and resulting in personal injury and possible death.

Snow chains Use only snow chains that are tested and recommended by Mercedes-Benz. Your authorized Mercedes-Benz Light Truck Center will be glad to advise you on this subject. Snow chains should be used on all four wheels. With only two chains available, they should be mounted on the rear wheels. Follow the manufacturer’s mounting instructions. Snow chains should only be driven on snow covered roads at speeds not to exceed 30 mph (50 km/h). Remove chains as soon as possible when driving on roads without snow. When driving with snow chains, press the ESP control switch to OFF, refer to page 225.

Model ML 55 AMG Use of snow chains is not permissible with tire size 285/50 R 18.

Winter driving instructions The most important rule for slippery or icy roads is to drive sensibly and to avoid abrupt acceleration, braking and steering maneuvers. Do not use the cruise control system under such conditions. When the vehicle is in danger of skidding, move selector lever to position “N”. Try to keep the vehicle under control by corrective steering action.

Caution! Do not use LOW RANGE mode when driving on ice or packed snow. At speeds below 18 mph (30 km/h) vehicle steering is adversely affected by the LOW RANGE ABS, see page 220. Road salts and chemicals can adversely affect braking efficiency. Increased pedal force may become necessary to produce the normal brake effect. We therefore recommend depressing the brake pedal periodically when traveling at length on salt-strewn roads. This can bring road salt impaired braking efficiency back to normal. A prerequisite is, however, that this be done without endangering other drivers on the road.

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If the vehicle is parked after being driven on salt treated roads, the braking efficiency should be tested as soon as possible after driving is resumed while observing the safety rules in the previous paragraph.

Warning! If the vehicle becomes stuck in snow, make sure that snow is kept clear of the exhaust pipe and from around the vehicle with engine running. Otherwise, deadly carbon monoxide (CO) gases may enter vehicle interior resulting in unconsciousness and death. To assure sufficient fresh air ventilation, open a window slightly on the side of the vehicle not facing the wind.

Winter driving Have your vehicle winterized at your authorized Mercedes-Benz Light Truck Center before the onset of winter. • Change the engine oil if the engine contains an oil

which is not approved for winter operation. For viscosity (SAE/CCMC class) and filling quantity, see page 314.

• Check engine coolant anticorrosion/antifreeze

concentration.

• Additive for the windshield washer and headlamp

cleaning system: Add MB Concentrate “S” to a premixed windshield washer solvent/antifreeze which is formulated for below freezing temperatures see page 259.

• Test battery: Battery capacity drops with decreasing ambient temperature. A well charged battery helps to ensure that the engine can be started, even at low ambient temperatures.

• Tires: We recommend M+S rated radial-ply tires on

all four wheels for the winter season. Observe permissible maximum speed for M+S rated radial-ply tires and the legal speed limit.

In winter operation, the maximum effectiveness of the antilock brake system (ABS), the four wheel electronic traction system (4-ETS+), the electronic stability program (ESP), and electronic brake proportioning (EBP) can only be achieved with M+S rated radial-ply tires and/or snow chains recommended by Mercedes-Benz. Snow chains maximize performance. For driving instructions using snow chains see page 199.

Deep water

Passenger compartment

Caution! Do not drive through flooded areas or water of unknown depth. Before driving through water, determine its depth. It should not be deeper than approximately 20 inches (50 cm). If you must drive through deep water, drive slowly to prevent water from entering the engine compartment or passenger compartment, being ingested by the air intake, possibly causing damage to electrical components or wiring, to engine or transmission that is not covered by the Mercedes-Benz Limited Warranty.

Block heater (Canada only) The engine is equipped with a block heater. The electrical cable may be installed at your authorized Mercedes-Benz Light Truck Center.

Warning! Always fasten items being carried as securely as possible. In an accident, during hard braking or sudden maneuvers, loose items will be thrown around inside the vehicle, and cause injury to vehicle occupants unless the items are securely fastened in the vehicle. The trunk is the preferred place to carry objects.

Traveling abroad Abroad, there is a widely-spread Mercedes-Benz service network at your disposal. If you plan to travel into areas which are not listed in the index of your Mercedes-Benz Light Truck Center directory, you should request pertinent information from your authorized Mercedes-Benz Light Truck Center.

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Off-Road driving Familiarize yourself with the vehicle characteristics and gear changing before you attempt any difficult terrain off-road driving. We recommend that you start out with easy off-road travel. Please read this chapter carefully before you begin off-road travel. Special driving features are available for specific kinds of operation: • LOW RANGE mode, see page 227
• LOW RANGE - ABS, see page 220
• LOW RANGE - 4-ETS+, see page 222
• LOW RANGE - ESP, see page 226
Engage the LOW RANGE mode before driving under off-road conditions. For switching LOW RANGE mode on and off see page 227. Fasten items being carried as securely as possible, see page 154. We recommend to keep doors, liftgate, windows, and roof closed whenever driving in off-road mode.

Important! Adjust vehicle speed to condition of terrain. The more uneven, rutty and steeper the terrain, the lower the speed should be. Watch out for obstacles, such as rocks, holes, tree-stumps, ruts. Be especially careful when driving in unknown territory. Eventually get out of the vehicle and scout the path you intend to take. Continuous and speedy driving in sandy soil overcomes the vehicle rolling resistance, and helps to prevent the vehicle from sinking into the ground. Do not initiate jumps with the vehicle. It interrupts the forward momentum of the vehicle. Sand, dirt, mud and other material having friction property, can cause exceptional wear and tear as well as failure of the brakes. In this case the brakes may be less effective or even fail when you most need them. Always clean and check the brakes following each off-road trip.

Checklist before off-road driving • Tires: Check the tread depth and maintain specified tire pressure (see tire pressure label inside the fuel filler flap). Check tires for possible damage and remove foreign objects. The valve caps must be mounted.

• Rims: Dented or bent rims can cause tire pressure

loss and damage the tire beads. For this reason, check and, if neccesary, change rims before driving off-road.

• Vehicle tool kit: Check if the vehicle jack is

functional. In all cases take the vehicle tool kit, a strong tow rope, a shovel and a small plank (to put under the vehicle jack on sandy soil) with you.

Driving in steep terrain

Slope angle: 1 26° (ML 320 and ML 500)

21° (ML 55 AMG)

2 26° (ML 320 and ML 500)

23° (ML 55 AMG)

Switch to LOW RANGE mode before starting to drive up or down steep inclines, see page 227. Maximum vehicle climbing ability is a 60% grade.

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Driving on embankments, slopes and other steep inclines should only be done straight up or downhill, i.e. in the line of gravity. Do not drive along the side of a slope (danger of vehicle rollover). If in doing so, the vehicle begins to show a tendency to roll, immediately steer into a line of gravity (straight up or downhill). To help avoid the vehicle rolling over, never turn it around on steep inclines. If the vehicle cannot complete the attempted climb, back it down in reverse gear. Utilize the engine’s braking power when descending a slope, observe the engine speed (do not overrev the engine). Apply the service brake as needed. Check the brakes after a lengthy downgrade drive.

Notes: Avoid excessive engine speeds – drive with moderate engine speeds (max. 3000 RPM). Select gear range “2” or “1” on the automatic transmission, see page 183.

Traction in steep terrain: Be easy on the accelerator and watch for continuous wheel traction when driving in steep terrain. The 4-ETS+ helps greatly when starting out on a steep incline when the front wheels have then the tendency to slip due to the weight shifting away the front axle. The 4-ETS+ recognizes the situation and limits the torque for the front wheels by braking them. Simultaneously the torque for the rear wheels is increased. See page 221 for four wheel electronic traction system (4-ETS+).

Driving across a hilltop: To prevent the vehicle from speeding up too much after climbing a hill, decelerate just ahead of a hilltop (do not select gear range “N”). Use the momentum of the vehicle to drive across the hilltop. Driving in this manner prevents the vehicle from jumping across the hilltop and thus loosing its forward momentum.

Driving downhill: Select gear range “1” on the automatic transmission, see page 183. Drive downhill observing the same rules as driving uphill. Driving on embankments, slopes and other steep inclines should only be done straight up or downhill, i.e. in the line of gravity. Do not drive along the side of a slope (danger of vehicle rollover). If in doing so, the vehicle begins to show a tendency to roll, immediately steer into a line of gravity (straight up or downhill).

Utilize the engine’s braking power when descending a slope, observe the engine speed (do not overrev the engine). Apply the service brake as needed. The special LOW range ABS setting allows for precise and brief (cyclical) blocking of the front wheels, permitting them to dig into loose ground. Remember that the front wheels when stopped, slide across a surface, thus loose their ability to steer the vehicle. Check the brakes after a lengthy downgrade drive.

Important! Only apply the service brake if the vehicle travels straight downhill, i.e. in the line of gravity.

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Driving through water

Switch to LOW RANGE mode before driving through water. Switch off the exterior lamps as well as the climate control. Enter the water only at a shallow spot. Never take a running start. Drive slowly, avoiding a bow wave. Do not stop vehicle immersed in water, and do not shut off the engine. To dry the brakes, apply pressure to the brake pedal several times after leaving the water.

1 20 in (50 cm)

Before driving through water, determine its depth. It should not be deeper than approximately 20 inches (50 cm).

Notes: Check the vehicle clearance before crossing obstacles that possibly could damage the undercarriage. If possible use the assistance of a second person. Special attention is needed when crossing obstacles on a steep incline. The vehicle could slide sideways as a result of its possible slanted position.

Ruts: Select gear range “1” on the automatic transmission, see page 183. A number of off-road tracks or other byways have deep ruts which can cause the undercarriage to come in contact with the ground. Drive next to the ruts rather than through them if at all possible.

Notes: Check the vehicle clearance. Damage on the vehicle definitely increases the chance for a subsequent accident.

Crossing obstacles: Select gear range “1” on the automatic transmission, see page 183.

Cross obstacles (e.g. tree stumps or big rocks) very slowly by aiming one of the front wheels at the center of the obstacle, and repeat same with the rear wheel.

Important! Damage on the vehicle definitely increases the chance for a subsequent accident.

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Returning from off-road driving Off-road driving increases strain on the vehicle. We recommend that you inspect the vehicle for possible damage after each off-road trip. Recognizing any damage and a subsequent timely repair reduces the chance of a possible breakdown or accident later on. Proceed as follows: • Switch off the LOW RANGE mode, see page 227. • Remove excessive dirt from tires, wheels, wheel

housings, and underbody. For instance, after driving in mud, clean the radiator, chassis, engine, brakes, and wheels from extreme dirt, using a strong jet of water.

• Inspect frame, oil pan, brake hoses, etc., as well as

vehicle underbody for possible damage.

• Check tires for possible damage, clean all exterior

lamps, and conduct a brake test.

• Check for brush or branches caught in the

undercarriage. They could increase the possibility of a fire, as well as cut fuel and/or brake lines, puncture rubber bellows of the axles or drive shafts.

• After continued operation in mud, sand, water or

other dirty conditions clean the brake discs, wheels, brake pads and check and clean axle joints.

Warning! If you feel a sudden significant vibration or ride disturbance, or you suspect that possible damage to your vehicle has occurred, you should turn on the hazard warning flashers, carefully slow down, and drive with caution to an area which is a safe distance from the roadway. Inspect the tires and under the vehicle for possible damage. If the vehicle or tires appear unsafe, have it towed to the nearest Mercedes-Benz Light Truck Center or tire dealer for repairs.

Electrical connections The vehicle is prewired to accept the seven-wire harness included in the Mercedes-Benz approved trailer hitch receiver kit. An additional four-pole conversion plug is included in the Mercedes-Benz supplied trailer hitch receiver kit. For further information, please see your authorized Mercedes-Benz Light Truck Center. In order to prevent possible damage to the vehicle’s electrical system by incorrectly installing the trailer wiring plug, we recommend having the harness connected at an authorized Mercedes-Benz Light Truck Center.

Trailer towing

Warning! Failure to use proper equipment and driving technique can result in a loss of vehicle control when towing a trailer. Improper towing or failure to follow the instructions contained in this guide can result in serious injury. Follow the guidelines below carefully to assure safe trailer operation. Ask your authorized Mercedes-Benz Light Truck Center should you require an explanation of information contained in this guide.

Trailer Hitches Only install a trailer hitch receiver approved for your vehicle. For information on availability and installation, please see your authorized Mercedes-Benz Light Truck Center. The bumpers on your vehicle are not designed for use with clamp-type hitches. Do not attach rental hitches or other bumper-type hitches to them. To reduce the possibility of damage, remove the hitch ball adaptor from the receiver when not in use.

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Vehicle and trailer weights and ratings Gross Vehicle Weight Rating (GVWR) is the maximum permissible vehicle weight: 6614 lbs. (3000 kg) Gross Vehicle Weight (GVW): comprises weight of vehicle including fuel, tools, spare wheel, installed accessories, passengers, cargo and trailer tongue. It must never exceed the GVWR. Gross Axle Weight Rating (GAWR) is the maximum permissible axle weight:

front rear

2976 lbs. 3858 lbs.

(1350 kg) (1750 kg)

Gross Trailer Weight (GTW) is the maximum permissible trailer weight to be towed: 5000 lbs. (2260 kg) Trailer Tongue Weight Rating (TWR) is the maximum permissible weight of the trailer tongue: [500 lbs. (225 kg) limit for MB approved hitch receiver]

Loading a trailer When loading a trailer, you should observe that neither the permissible GTW, nor the GVWR are exceeded. Maximum permissible values are listed on the safety compliance certification labels for the vehicle and for the trailer to be towed. The lowest value listed must be selected when determining how the vehicle and trailer are loaded. We recommend loading the trailer in such a manner that it has a tongue weight (TW) between 10% and 15% of the GTW. The tongue weight at the hitch ball must be added to the GVW to prevent exceeding your Mercedes-Benz tow vehicle’s rear GAWR.

Checking weights of vehicle and trailer To assure that the tow vehicle and trailer are in compliance with the maximum permissible weight limits, and to know the actual weights, have the loaded rig (tow vehicle including driver, passengers and cargo, trailer fully loaded) weighed on a commercial scale. Check the vehicle’s front and rear Gross Axle Weight (GAW), the GTW and TW. The values as measured must not be exceeded, according to the weight listed under “Vehicle and trailer weight and ratings”.

Attaching a trailer Please observe maximum permitted trailer dimensions (width and length). Most states and all Canadian provinces require safety chains between your tow vehicle and the trailer. The chains should be crisscrossed under the trailer tongue. They must be attached to the hitch receiver, and not to the vehicle’s bumper or axle. Be sure to leave enough slack in the chains to permit turning corners. Most states and all Canadian provinces require a separate brake system at various trailer weights.

Caution! Do not connect a trailer brake system (if trailer is so equipped) directly to the vehicle’s hydraulic brake system, as your vehicle is equipped with antilock brakes. If you do, neither the vehicle’s brakes nor the trailer’s brakes will function properly.

The provided vehicle electrical wiring harness for trailer towing has a brake signal wire (color orange) for hook-up to a brake controller. Most states and all Canadian provinces require a break-away switch on trailers with a separate brake system. The switch activates the trailer brakes in the possible event that the trailer might separate from the tow vehicle. You should consider using a trailer sway control system. For further information see your authorized Mercedes-Benz Light Truck Center.

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Towing a trailer There are many different laws, including speed limit restrictions, having to do with trailer towing. Make sure that your rig will be legal, not only for where you reside, but also for where you will be driving. A good source for this information can be the police or local authorities. Before you start driving with the trailer, check the trailer hitch, break-away switch, safety chains, electrical connections, lighting and tires. Also adjust the mirrors to permit unobstructed view beyond rear of trailer. If the trailer has electric brakes, start your vehicle and trailer moving slowly, and then apply only the trailer brake controller by hand to be sure the brakes are working properly. When towing a trailer, check occasionally to be sure that the load is secure, and that lighting and trailer brakes (if so equipped) are functioning properly. Always secure items in the trailer to prevent load shifts while driving. Take into consideration that when towing a trailer, the handling characteristics are different and less stable from those when operating the vehicle without a trailer. It is important to avoid sudden maneuvers.

The vehicle and trailer combination is heavier, and therefore is limited in acceleration and climbing ability, and requires longer stopping distances. It is more prone to reacting to side wind gusts, and requires more sensitive steering input. In order to gain skill and an understanding of the vehicle’s behavior, you should practice turning, stopping and backing up in an area which is free from traffic. If possible, do not brake abruptly, but rather engage the brake slightly at first to permit the trailer to activate its brake. Then increase the braking force.

Caution! If the trailer should begin to sway, reduce the vehicle’s speed and use the brake controller by hand to straighten out the vehicle and trailer. In no case should you attempt to straighten out the tow vehicle and trailer by increasing the speed or oversteering and stepping on the brakes.

If the transmission hunts between gears on inclines, manually shift to a lower gear (select “4”, “3”, “2” or “1”). A lower gear and reduction of speed reduces the chance of engine overloading and/or overheating.

At very steep inclines, not manageable with selector lever in position “1”, switch transfer case to LOW RANGE, see page 227 for instructions on how to engage LOW RANGE. When going down a long hill, shift into a lower gear and use the engine’s braking effect. Avoid riding the brakes, thus overheating the vehicle and trailer brakes. If the engine coolant rises to an extremely high temperature (coolant temperature needle approaching the red zone) when the air conditioner is on, turn off the air conditioner. Engine coolant heat can be additionally vented by opening the windows, switching the climate control fan speed to high and setting the temperature control to the maximum hot position. Extreme care must be exercised since your vehicle with a trailer will require additional passing distance ahead than when driving without a trailer. Because your vehicle and trailer is longer than your vehicle alone, you will also need to go much farther ahead of the passed vehicle before you can return to your lane.

Parking

Warning! To reduce the risk of personal injury, or damage to the vehicle powertrain, as a result of vehicle/trailer movement, always: 1. Keep right foot on brake pedal. 2. Shift gear selector lever to position “N”. 3. Have a second person place wheel chocks on downhill side of left and right trailer wheels.

4. Slowly release brake pedal and let vehicle and

trailer roll into chocks until stopped. 5. Firmly depress parking brake pedal. 6. Move gear selector lever to position “P”. 7. On inclines turn front wheels towards the road

curb.

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Instruments and controls

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Cruise control

The cruise control allows you to drive in a more relaxed manner, for example over long distances, as it automatically maintains the set speed by actively regulating the throttle setting. Any given speed above approximately 20 mph (30 km/h) can be maintained with the cruise control by operating the lever.

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1 Accelerate and set:

Lift lever briefly to set speed. Hold lever up to accelerate.

2 Decelerate and set:

Depress lever briefly to set speed. Hold lever down to decelerate. Normally the vehicle is accelerated to the desired speed with the accelerator. Speed is set by briefly pushing the lever to position 1 or 2. The accelerator can then be released. The speed can be increased (e.g. for passing) by using the accelerator. After the accelerator is released, the previously set speed will be resumed automatically. If a set speed is to be increased or decreased slightly, e.g. to adapt to the traffic flow, hold lever in position 1 or 2 until the desired speed is reached, or briefly tip the lever in the appropriate direction for increases or decreases in 0.6 mph (1 km/h) increments. When the lever is released, the newly set speed remains.

3 Canceling

To cancel the cruise control, briefly push lever to position 3. When you step on the brake pedal or the vehicle speed drops below approximately 20 mph (30 km/h), for example when driving upgrade, the cruise control will be canceled. If the cruise control cancels by itself and remains inoperative until the engine is restarted, have the system checked at your authorized Mercedes-Benz Light Truck Center as soon as possible.

4 Resume

If the lever is briefly pushed to position 4 when driving at a speed exceeding approximately 20 mph (30 km/h), the vehicle resumes the speed which was set prior to the cancellation of the cruise control. The last memorized speed is canceled when the key in the steering lock is turned to position 1 or 0.

Important! Moving gear selector lever to position “N” switches the cruise control off.

Warning! Only use the cruise control if the traffic and weather conditions make it advisable to travel at a steady speed.

• The use of cruise control can be dangerous on

winding roads or in heavy traffic because conditions do not allow safe driving at a steady speed.

• The use of cruise control can be dangerous on slippery roads. Rapid changes in tire adhesion can result in wheel spin and loss of control.

The “Resume” function should only be operated if the driver is fully aware of the previously set speed and wishes to resume this particular preset speed.

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Notes: If the engine does not brake the vehicle sufficiently while driving on a downgrade, the speed you set on the cruise control may be exceeded. In this case the automatic transmission shifts down (max. to 3rd gear) to maintain the set cruise control speed by using the engine’s braking power. As soon as the grade eases, the automatic transmission shifts up again dependent on the selector lever position. Nevertheless, in some cases you may have to step on the brake pedal to slow down. In this case the cruise control is switched off. Use the lever to resume the previously set speed.

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Transmission in LOW RANGE mode The cruise control should not be activated during off- road driving in the LOW RANGE mode. Doing so could reduce driving comfort.

Trailer operation When towing a trailer, do not allow engine speed to drop too low on inclines. Select a lower range (“3”, “2” or “1”) in time, depending on the degree of the incline. This is also valid with cruise control activated. At extreme inclines switch to LOW RANGE mode, see page 227.

Note: For detailed information see trailer towing on page 209.

Brake assist system (BAS)

Warning! BAS cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase braking efficiency beyond that afforded by the condition of the vehicle brakes and tires or the traction afforded. The BAS cannot prevent accidents, including those resulting from excessive speed in turns, following another vehicle too closely, or aquaplaning. Only a safe, attentive, and skillful driver can prevent accidents. The capabilities of a BAS equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.

The BAS is designed to maximize the vehicle’s braking capability during emergency braking maneuvers by having maximum power boost applied to the brakes more quickly in emergency braking conditions than might otherwise be afforded solely by the driver’s braking style. This can help reduce braking distances over what ordinary driving and braking style might do. The BAS complements the antilock brake system (ABS). Applying the brakes very quickly results in maximum BAS assistance. To receive the benefit of the system you must apply continuous full braking power during the stopping sequence. Do not reduce brake pedal pressure. Once the brake pedal is released, the BAS is deactivated. The malfunction indicator lamp for the electronic stability program (ESP) is combined with the BAS malfunction indicator lamp.

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The BAS/ESP malfunction indicator lamp in the instrument cluster comes on with the key in steering lock position 2 and should go out with the engine running. If the BAS/ESP malfunction indicator lamp comes on permanently while the engine is running, a malfunction has been detected in either system. As a result, it is possible that now only partial engine output will be available. If the BAS malfunctions, the brake system functions in the usual manner, but without BAS.

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If the charging voltage falls below 10 volts, the malfunction indicator lamp comes on and the BAS and the ESP are switched off. When the voltage is above this value again, the malfunction indicator lamp should go out and the BAS is operational. With the ABS malfunctioning, the BAS is also switched off. Both malfunction indicator lamps come on with the engine running. If the BAS/ESP malfunction indicator lamp stays illuminated, have the BAS or ESP checked at your authorized Mercedes-Benz Light Truck Center as soon as possible.

Antilock brake system (ABS)

Warning! Do not pump the brake pedal, rather use firm, steady brake pedal pressure. Pumping the brake pedal defeats the purpose for ABS and significantly reduces braking effectiveness.

Important! The ABS improves steering control of the vehicle during hard braking maneuvers. The ABS prevents the wheels from locking up above a vehicle speed of approximately 5 mph (8 km/h) independent of road surface conditions. At the instant one of the wheels is about to lock up, a slight pulsation can be felt in the brake pedal, indicating that the ABS is in the regulating mode. Keep firm and steady pressure on the brake pedal while experiencing the pulsation. Continuous steady brake pedal pressure results in applying the advantages of the ABS, namely braking power and ability to steer the vehicle.

In the case of an emergency brake maneuver keep continuous full pressure on the brake pedal. In this manner only can the ABS be most effective. On slippery road surfaces, the ABS will respond even with light brake pedal pressure because of the increased likelihood of locking wheels. The pulsating brake pedal can be an indication of hazardous road conditions and functions as a reminder to take extra care while driving.

ABS control The ABS malfunction indicator lamp - in the instrument cluster comes on with the key in steering lock position 2 and should go out with the engine running. When the ABS malfunction indicator lamp - in the instrument cluster comes on while the engine is running, it indicates that the ABS has detected a malfunction and has switched off. In this case, the brake system functions in the usual manner, but without antilock assistance. With the ABS malfunctioning, the BAS, EBP, ESP and 4-ETS+ are also switched off. The malfunction indicator lamps come on with the engine running.

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If the charging voltage falls below 10 volts, the malfunction indicator lamp comes on and the ABS is switched off. When the voltage is above this value again, the malfunction indicator lamp should go out and the ABS is operational. If the ABS malfunction indicator lamp stays illuminated, have the system checked at your authorized Mercedes-Benz Light Truck Center as soon as possible.

Notes: To alert following vehicles to slippery road conditions you discover, operate your hazard warning flashers as appropriate. Operating the vehicle on a single axle dynamometer should only be done for briefly testing the brakes. To do so, move selector lever to position “N”. The engine must be shut off (key in steering lock position 0 or 1).

Warning! ABS cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase braking or steering efficiency beyond that afforded by the condition of the vehicle brakes and tires or the traction afforded. The ABS cannot prevent accidents, including those resulting from excessive speed in turns, following another vehicle too closely, or aquaplaning. Only a safe, attentive, and skillful driver can prevent accidents. The capabilities of an ABS equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.

LOW RANGE – ABS During off-road driving a special low range system for the antilock brake system (ABS) is operational with transmission in LOW RANGE mode, see page 229. When applying the service brakes at speeds below approximately 18 mph (30 km/h), the front wheels are locked cyclically to shorten the braking distance (dig in effect). This affects steering the vehicle.

Four-wheel electronic traction system (4-ETS+) With the key in steering lock position 2, the yellow 4-ETS+ malfunction indicator lamp { and the 4-ETS+ warning lamp v come on and should go out when the engine is running. The 4-ETS+ improves vehicle’s ability to utilize available traction, especially under slippery road conditions. The brakes are applied to the spinning wheel and power is transferred to the wheel(s) with traction. The traction control engages at vehicle speeds up to approx. 24 mph (40 km/h), and switches off at 50 mph (80 km/h). The 4-ETS+ warning lamp v, located in the speedometer dial, starts to flash at any vehicle speed, as soon as the tires lose traction and the wheels begin to spin.

Important! If the 4-ETS+ warning lamp v flashes: • During take-off, apply as little throttle as possible. • While driving, ease up on the accelerator. • Adapt your speed and driving to the prevailing road

conditions.

4-ETS+ Control If the yellow 4-ETS+ malfunction indicator lamp { comes on while the 4-ETS+ warning lamp v flashes, the electronic traction system is being switched off temporarily to prevent overheating of the drive wheel brakes. If the 4-ETS+ malfunction indicator lamp { comes on with the engine running, a malfunction has been detected. Have the 4-ETS+ checked at your authorized Mercedes-Benz Light Truck Center as soon as possible. With the ABS malfunctioning, the 4-ETS+ is also switched off.

Caution! If the vehicle is towed with the front axle raised (see towing the vehicle on page 277), or when testing the parking brake on a brake test dynamometer, the engine must be shut off (key in steering lock position 0 or 1). Otherwise, the electronic traction system will immediately be engaged and will apply the rear wheel brakes.

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Note: In winter operation, the maximum effectiveness of the electronic traction system is only achieved with Mercedes-Benz recommended M+S rated radial-ply tires and/or snow chains.

LOW RANGE – 4-ETS+ During off-road driving a special low range system for the four wheel electronic traction system (4-ETS+) is operational with transmission in LOW RANGE mode, see page 229. If one or more tires lose traction while driving downhill (accelerator released), the 4-ETS+ engages and the warning lamp v, located in the speedometer dial, starts to flash.

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Electronic brake proportioning (EBP) The EBP enhances braking effectiveness by allowing the rear brakes to supply a greater proportion of the braking effort without a loss of vehicle stability. If a warning tone sounds for five seconds and the symbols É and - are displayed in the instrument cluster, the system has detected a malfunction and is switched off. Have the system checked immediately at an authorized Mercedes-Benz Light Truck Center. Failure to do so could result in an accident, since the enhanced braking effect is not available when the system is switched off.

Note: When the EBP is switched off, every time the engine is started, a warning tone will sound for five seconds and the symbols É and - will light up. In addition, whenever the brakes are applied at speeds exceeding 25 mph (40 km/h), the warning tone sounds for five seconds.

Electronic stability program (ESP)

Warning! ESP cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase the traction afforded. The ESP cannot prevent accidents, including those resulting from excessive speed in turns, or aquaplaning. Only a safe, attentive, and skillful driver can prevent accidents. The capabilities of an ESP equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.

The ESP enhances directional control and reduces driving wheel spin of the vehicle under various driving conditions. Over-/understeering of the vehicle is counteracted by applying brakes to the appropriate wheel to create a countervailing vehicle movement. Engine torque is also limited. The ESP warning lamp, located in the speedometer dial, starts to flash when ESP is in operation.

Important! If the ESP warning lamp v flashes: • During take-off apply as little throttle as possible. • While driving ease up on the accelerator. • Adapt your speed and driving to the prevailing road

conditions.

• Do not switch off the ESP.

Caution! If the vehicle is towed with the front axle raised (see towing the vehicle on page 277), the engine must be shut off (key in steering lock position 0 or 1). Otherwise, the ESP will immediately be engaged and will apply the rear wheel brakes.

Notes: The malfunction indicator lamp for the ESP is combined with that of the BAS. The yellow BAS/ESP malfunction indicator lamp ¿ in the instrument cluster and the yellow ESP warning lamp v in the speedometer dial come on with the key in steering lock position 2. They should go out with the engine running.

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If the BAS/ESP malfunction indicator lamp ¿ comes on continuously with the engine running, a malfunction has been detected in either system. Only partial engine output will be available. If the BAS malfunctions, the brake system functions in the usual manner, but without BAS. If the BAS/ESP malfunction indicator lamp stays illuminated, have the BAS or ESP checked at your authorized Mercedes-Benz Light Truck Center as soon as possible. With the ABS malfunctioning, the ESP is also switched off. Driving the vehicle with varied size tires will cause the wheels to rotate at different speeds, therefore the ESP may activate (yellow ESP warning lamp v in speedometer dial comes on). For this reason, all wheels, including the spare wheel, must have the same tire outside diameter. When testing the parking brake on a brake test dynamometer, the engine must be shut off. Otherwise, the ESP will immediately be engaged and will apply the rear wheel brakes.

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In winter operation, the maximum effectiveness of the ESP is only achieved with Mercedes-Benz recommended M+S rated radial-ply tires and/or snow chains.

Synchronizing ESP If the power supply was interrupted (battery disconnected or empty), the BAS/ESP malfunction indicator lamp may be illuminated with the engine running. Turn steering wheel completely to the left and then to the right. The BAS/ESP malfunction indicator lamp should go out. If battery voltage drops below 10 volts, the indicator lamp comes on and the brake assist system (BAS) is deactivated. If the battery voltage rises and exceeds 10 volts, the BAS/ESP malfunction indicator lamp goes out, and brake assist system (BAS) is functional again. After driving off the BAS/ESP malfunction indicator lamp should go out after approximately 110 - 220 yd (100 - 200 m).

ESP control switch

P54.25-2037-26

ESP control switch located in center console. To switch ESP off, press upper half of switch. ESP warning lamp v, located in speedometer dial, comes on. To switch ESP on again, press lower half of switch. ESP warning lamp v, located in speedometer dial, goes out.

To improve the vehicle’s traction when driving with snow chains, or starting off in deep snow, sand or gravel, or off-road driving, switch off ESP by pressing the upper half of the ESP switch. The ESP warning lamp v, located in the speedometer dial, is continuously illuminated.

Warning! ESP should not be switched off during normal driving other than in circumstances described above. Disabling of the system will reduce vehicle stability in standard driving maneuvers. When the ESP warning lamp is illuminated continuously, the ESP is switched off. Adapt your speed and driving to the prevailing road conditions.

With the ESP system switched off, the engine torque reduction feature is cancelled. Therefore, the enhanced vehicle stability offered by ESP is unavailable. A portion of the ESP system remains active, even with the switch in the OFF position.

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If one drive wheel loses traction and begins to spin, the brake is applied until the wheel regains sufficient traction. The traction control engages at vehicle speeds up to approx. 24 mph (40 km/h), and switches off at 50 mph (80 km/h).

Note: Avoid spinning of one drive wheel. This may cause serious damage to the drive train which is not covered by the Mercedes-Benz Limited Warranty. The ESP warning lamp, located in the speedometer dial, starts to flash at any vehicle speed as soon as the tires lose traction and the wheels begin to spin. To return to the enhanced vehicle stability offered by ESP: press lower half of the switch (the ESP warning lamp in the speedometer dial goes out).

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Important! If the ESP warning lamp flashes: • During take-off, apply as little throttle as possible, • While driving, ease up on the accelerator. • Adapt your speed and driving to the prevailing road

conditions.

• Do not switch off the ESP.

LOW RANGE – ESP During off-road driving a special low range system for the electronic stability program (ESP) is operational with transmission in LOW RANGE mode, see page 229. In the LOW RANGE mode the electronic stability program (ESP) operates in a traction improving fashion specifically adapted for off-road driving. At speeds below 27 mph (45 km/h) the ESP assists in over-/ understeering, thus improving vehicle tracking.

Transmission control – LOW RANGE mode

The switch is located in the instrument panel.

Important! When switching to or from the LOW RANGE mode, observe the following: • The vehicle must be at a complete standstill. • The engine speed must not exceed 1500 rpm.

Failure to do so may result in transmission/engine damage not covered by the Mercedes-Benz Limited Warranty The LOW RANGE mode should be switched on: • during off-road driving, • when crossing waters, • when towing up or down on steep gradients, or additional practical hints refer to off-road driving on page 202.